错误信息：
17/05/20 18:51:39 ERROR JobScheduler: Error running job streaming job 1495277499000 ms.0
org.apache.spark.SparkException: Task not serializable
at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:298)
at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:288)
at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:108)17/05/20 18:51:39 ERROR JobScheduler
